file transfer error using xmpp client and openfire server

Error coming like this:

"Error: [object Element] at Object.Strophe.addConnectionPlugin._fail (http://127.0.0.1:58889/http-services/emulator-webserver/ripple/userapp//C/Users/ Administrator/AppData/Local/XDK/xdk-scratchdir/2b05c0c1-bf27-465a-9ddb-da90dcdb5 336/platforms/android/assets/www/Js/strophe.si-filetransfer.js:107:10) at Object.eval [as handler] (http://127.0.0.1:58889/http-services/emulator-webserver/ripple/userapp//C/Users/ Administrator/AppData/Local/XDK/xdk-scratchdir/2b05c0c1-bf27-465a-9ddb-da90dcdb5 336/platforms/android/assets/www/Js/strophe.min.js:2:19333) at Object.f.Handler.run (http://127.0.0.1:58889/http-services/emulator-webserver/ripple/userapp//C/Users/ Administrator/AppData/Local/XDK/xdk-scratchdir/2b05c0c1-bf27-465a-9ddb-da90dcdb5 336/platforms/android/assets/www/Js/strophe.min.js:2:15804) at eval (http://127.0.0.1:58889/http-services/emulator-webserver/ripple/userapp//C/Users/ Administrator/AppData/Local/XDK/xdk-scratchdir/2b05c0c1-bf27-465a-9ddb-da90dcdb5 336/platforms/android/assets/www/Js/strophe.min.js:2:22417) at Object.f.forEachChild (http://127.0.0.1:58889/http-services/emulator-webserver/ripple/userapp//C/Users/ Administrator/AppData/Local/XDK/xdk-scratchdir/2b05c0c1-bf27-465a-9ddb-da90dcdb5 336/platforms/android/assets/www/Js/strophe.min.js:2:8457) at Object.f.Connection._dataRecv (http://127.0.0.1:58889/http-services/emulator-webserver/ripple/userapp//C/Users/ Administrator/AppData/Local/XDK/xdk-scratchdir/2b05c0c1-bf27-465a-9ddb-da90dcdb5 336/platforms/android/assets/www/Js/strophe.min.js:2:22250) at Object.Strophe.Bosh._onRequestStateChange (http://127.0.0.1:58889/http-services/emulator-webserver/ripple/userapp//C/Users/ Administrator/AppData/Local/XDK/xdk-scratchdir/2b05c0c1-bf27-465a-9ddb-da90dcdb5 336/platforms/android/assets/www/Js/strophe.min.js:3:6555)"

can u give a solution for me

this is my code

   var nickname=Server.jid_to_name(intel.xdk.cache.getCookie("SelectedJid"));

            if (this.files) {

                var file = this.files[0];

                var filename = Cryptocat.random.encodedBytes(16, CryptoJS.enc.Hex);

                filename += file.name.match(/\.(\w)+$/)[0];

                //Cryptocat.buddies[nickname].otr.sendFile(filename);

                var key = null;

var to ="nickname+"@"+Server.HostName+"/"+intel.xdk.device.uuid";

Server.connection.si_filetransfer.send(

    /* jshint +W106 */

        to,

        sid,

        data.filename,

        data.file.size,

        data.file.type,

        function(err) {

            if (err) {

                return console.log(err)

            }

            Server.connection.ibb.open(cn(data.to), sid, Cryptocat.otr.chunkSize, function(err) {

                if (err) {

                    return console.log(err)

                }

                Cryptocat.addToConversation(sid, Cryptocat.me.nickname, Cryptocat.buddies[data.to].id, 'file')

                Cryptocat.otr.sendFileData({

                    start: true,

                    to: data.to,

                    sid: sid

                })

            })